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<div id="version" align=right><b>petsc-3.7.5 2017-01-01</b></div>
<div id="bugreport" align=right><a href="mailto:petsc-maint@mcs.anl.gov?subject=Typo or Error in Documentation &body=Please describe the typo or error in the documentation: petsc-3.7.5 v3.7.5 docs/manualpages/Mat/MatGetRowIJ.html "><small>Report Typos and Errors</small></a></div>
<A NAME="MatGetRowIJ"><H1>MatGetRowIJ</H1></A>
Returns the compressed row storage i and j indices for sequential matrices.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
PetscErrorCode MatGetRowIJ(Mat mat,PetscInt shift,PetscBool symmetric,PetscBool inodecompressed,PetscInt *n,const PetscInt *ia[],const PetscInt *ja[],PetscBool *done)
</PRE>
Collective on <A HREF="../Mat/Mat.html#Mat">Mat</A>
<P>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>mat </B></TD><TD>- the matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>shift </B></TD><TD>- 0 or 1 indicating we want the indices starting at 0 or 1
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>symmetric </B></TD><TD>- <A HREF="../Sys/PETSC_TRUE.html#PETSC_TRUE">PETSC_TRUE</A> or <A HREF="../Sys/PETSC_FALSE.html#PETSC_FALSE">PETSC_FALSE</A> indicating the matrix data structure should be symmetrized
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>inodecompressed </B></TD><TD>- <A HREF="../Sys/PETSC_TRUE.html#PETSC_TRUE">PETSC_TRUE</A> or <A HREF="../Sys/PETSC_FALSE.html#PETSC_FALSE">PETSC_FALSE</A> indicating if the nonzero structure of the
inodes or the nonzero elements is wanted. For BAIJ matrices the compressed version is
always used.
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>n </B></TD><TD>- number of rows in the (possibly compressed) matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ia </B></TD><TD>- the row pointers [of length n+1]
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ja </B></TD><TD>- the column indices
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>done </B></TD><TD>- indicates if the routine actually worked and returned appropriate ia[] and ja[] arrays; callers
are responsible for handling the case when done == <A HREF="../Sys/PETSC_FALSE.html#PETSC_FALSE">PETSC_FALSE</A> and ia and ja are not set
</TD></TR></TABLE>
<P>
<P>
Notes: You CANNOT change any of the ia[] or ja[] values.
<P>
Use <A HREF="../Mat/MatRestoreRowIJ.html#MatRestoreRowIJ">MatRestoreRowIJ</A>() when you are finished accessing the ia[] and ja[] values
<P>
Fortran Node
<P>
In Fortran use
<pre>
<A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> ia(1), ja(1)
</pre>
<pre>
<A HREF="../Sys/PetscOffset.html#PetscOffset">PetscOffset</A> iia, jja
</pre>
<pre>
call <A HREF="../Mat/MatGetRowIJ.html#MatGetRowIJ">MatGetRowIJ</A>(mat,shift,symmetric,inodecompressed,n,ia,iia,ja,jja,done,ierr)
</pre>
<pre>
Acess the ith and jth entries via ia(iia + i) and ja(jja + j)
</pre>
<pre>
</pre>
<pre>
or
</pre>
<pre>
</pre>
<pre>
<A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A>, pointer :: ia(:),ja(:)
</pre>
<pre>
call MatGetRowIJF90(mat,shift,symmetric,inodecompressed,n,ia,ja,done,ierr)
</pre>
<pre>
Acess the ith and jth entries via ia(i) and ja(j)
</pre>
<P>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatGetColumnIJ.html#MatGetColumnIJ">MatGetColumnIJ</A>(), <A HREF="../Mat/MatRestoreRowIJ.html#MatRestoreRowIJ">MatRestoreRowIJ</A>(), <A HREF="../Mat/MatSeqAIJGetArray.html#MatSeqAIJGetArray">MatSeqAIJGetArray</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>developer
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/mat/interface/matrix.c.html#MatGetRowIJ">src/mat/interface/matrix.c</A>
<BR><A HREF="./index.html">Index of all Mat routines</A>
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